Method of transmitting control data for system conversion among liquid chromatographs
In the present invention, differences in liquid feed properties between liquid chromatographic devices are determined, a liquid feed time table that takes these differences into account is acquired by way of system changes, and flow control is performed by a pump. Furthermore, the liquid feed time table after the system changes is divided into a plurality of intervals, and instructions are sent to the pump after approximate calculations are performed. Thus, by efficiently performing system change processes, the same measurement results can be obtained in a plurality of different liquid chromatograph devices, regardless of the differences in liquid feed properties.
1. A first liquid chromatograph comprising:
a first liquid chromatograph unit which includes a first elution unit which pumps an eluent;
a first detecting unit which measures a component of a sample injected with the eluent pumped from the first elution unit; and
a control unit which controls elution performed by the first elution unit,
wherein the control unit includes:
an elution response storage unit which stores a first elution response of the first liquid chromatograph unit obtained by detection when a plurality of command values of a first time table are input to the first elution unit and stores a second elution response of a second liquid chromatograph, different from the first liquid chromatograph, obtained by detection when the plurality of command values of the first time table are input to a second elution unit of the second liquid chromatograph,
a conversion time table calculator which converts the first time table into a second time table based on the first elution response and the second elution response such that a first elution profile at a time when the first elution unit is controlled by the first liquid chromatograph unit based on the first time table approaches a second elution profile at a time when the second elution unit is controlled by the second liquid chromatograph based on the first time table, and
an approximating calculator which divides the second time table into a plurality of regions, performs a plurality of approximate calculations for each of the divided regions of the second time table, and changes the plurality of regions of the second time table based on a result of the approximate calculations,
wherein the control unit controls elution of the eluent pumped by the first elution unit based on the second time table divided into the plurality of regions.
2. The liquid chromatograph according to claim 1 ,
wherein the approximating calculator performs a plurality of polynomial approximations as the approximate calculations and obtains an approximation error of the approximate calculations for the second time table.
3. The liquid chromatograph according to claim 1 ,
wherein the approximating calculator changes the regions into which the second time table is divided based on whether an approximation error of the approximate calculations exceeds a predetermined threshold value.
4. The liquid chromatograph according to claim 1 ,
wherein the approximating calculator changes the regions into which the second time table is divided to be larger in size in a case where an approximation error of the approximate calculations does not exceed a predetermined threshold value.
5. The liquid chromatograph according to claim 4 ,
wherein the approximating calculator sets an upper limit in advance of a size of the regions to be divided for the second time table.
6. The liquid chromatograph according to claim 1 ,
wherein the first elution profile is a first gradient curve and the second elution profile is a second gradient curve.
7. The liquid chromatograph according to claim 1 ,
wherein performing the plurality of approximate calculations for each of the divided regions of the second time table generates an approximation curve for the second time table.
8. A method of processing data of a liquid chromatograph, the method comprising:
acquiring a first elution response regarding a first liquid chromatograph by detection when a plurality of command values of a first time table are input to a first elution unit of the first liquid chromatograph;
acquiring a second elution response regarding a second liquid chromatograph by detection, different from the first liquid chromatograph, when the plurality of command values of the first time table are input to a second elution unit of the second liquid chromatograph;
converting the first time table into a second time table based on the first elution response and the second elution response such that a first elution profile at a time when the first elution unit is controlled by the first liquid chromatograph unit based on the first time table approaches a second elution profile at a time when the second elution unit is controlled by the second liquid chromatograph based on the first time table;
dividing the second time table into a plurality of regions;
performing a plurality of approximate calculations for each of the divided regions of the second time table, and changing the plurality of regions of the second time table based on a result of the approximate calculations; and
controlling elution of an eluent pumped by the first elution unit of the first liquid chromatograph based on the second time table divided into the plurality of regions.
9. The method according to claim 8 ,
wherein the first elution profile is a first gradient curve and the second elution profile is a second gradient curve.
10. The method according to claim 8 ,
wherein performing the plurality of approximate calculations for each of the divided regions of the second time table generates an approximation curve for the second time table.
11. The method according to claim 8 ,
wherein performing the plurality of approximate calculations for each of the divided regions of the second time table comprises performing a plurality of polynomial approximations as the approximate calculations and obtaining an approximation error of the approximate calculations for the second time table.
12. The method according to claim 8 , further comprising:
changing the regions into which the second time table is divided based on whether an approximation error of the approximate calculations exceeds a predetermined threshold value.
13. The method according to claim 8 , further comprising:
changing the regions into which the second time table is divided to be larger in size in a case where an approximation error of the approximate calculations does not exceed a predetermined threshold value.
14. The method according to claim 13 , further comprising:
setting an upper limit in advance of a size of the regions to be divided for the second time table.
15. A liquid chromatograph apparatus comprising:
a first liquid chromatograph unit which includes a first elution unit which pumps an eluent;
a first detecting unit which measures a component of a sample injected with the eluent pumped from the first elution unit;
a second liquid chromatograph unit which includes a second elution unit which pumps an eluent;
a second detecting unit which measures a component of a sample injected with the eluent pumped from the second elution unit; and
a control unit which controls elution performed by the first elution unit,
wherein the control unit includes:
an elution response storage unit which stores a first elution response of the first liquid chromatograph unit obtained by detection when a plurality of command values of a first time table are input to the first elution unit and stores a second elution response of a second liquid chromatograph, different from the first liquid chromatograph, obtained by detection when the plurality of command values of the first time table are input to a second elution unit of the second liquid chromatograph,
a conversion time table calculator which converts the first time table into a second time table based on the first elution response and the second elution response such that a first elution profile at a time when the first elution unit is controlled by the first liquid chromatograph unit based on the first time table approaches a second elution profile at a time when the second elution unit is controlled by the second liquid chromatograph based on the first time table, and
an approximating calculator which divides the second time table into a plurality of regions, performs a plurality of approximate calculations for each of the divided regions of the second time table, and changes the plurality of regions of the second time table based on a result of the approximate calculations,
wherein the control unit controls elution of the eluent pumped by the first elution unit based on the second time table divided into the plurality of regions.
16. The liquid chromatograph apparatus according to claim 15 ,
wherein performing the plurality of approximate calculations for each of the divided regions of the second time table generates an approximation curve for the second time table.
17. The liquid chromatograph apparatus according to claim 15 ,
wherein the approximating calculator performs a plurality of polynomial approximations as the approximate calculations and obtains an approximation error of the approximate calculations for the second time table.
18. The liquid chromatograph apparatus according to claim 15 ,
wherein the approximating calculator changes the regions into which the second time table is divided based on whether an approximation error of the approximate calculations exceeds a predetermined threshold value.
19. The liquid chromatograph apparatus according to claim 15 ,
wherein the approximating calculator changes the regions into which the second time table is divided to be larger in size in a case where an approximation error of the approximate calculations does not exceed a predetermined threshold value.
20. The liquid chromatograph apparatus according to claim 19 ,
wherein the approximating calculator sets an upper limit in advance of a size of the regions to be divided for the second time table.